Pressure-controlling system.



E. A. MITCHELL.

PRESSURE CONTROLLI-NG SYSTEM.

APPLICATION FILED MAY 21. 1912.

Patented Mar. 7,1916.

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4 APPLICI-ON FILED MAYZT. 1912- 1,174,339. v v v Patented Mar. 7,1916.

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. E. A. MITCHELL.

- PRESSURE CONTHOLLING SYSTEM.

` APPLICATION FILED MAY 2?, 1912. j 1,174,339. Patented Mar. 7,1916.

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UNITED STATES Patrinvr- OFFICE.

EDWARD ALBERT MITCHELL, OF LONDON, ENGLAND.

rR-EssURE-CONTROLLING SYSTEM.

To all whom t may concern.'

le it known that l. linwam) Umnmhlrrcrb i:i.|.. a subject of thel King of Great Brit' aiu and Ireland. residing'at London, Eng.- land. have invented Improvements `in or Relating to l)ressure-(ontrolling Systems, of which the following is a'specifieation.

rThis invention relates to systems wherein, as for the distribution of high "pressure fluid such as gas or air, a reducing valve is employed to control the flow of fluid from one part of the system to another lower pressure part automatically in accordance with the consumption of fluid, or pressure variation due to an equivalent cause.

The inventionv includes among' its objects the vprovision of simplified means for operating the main or reducing valve. distinguished Jfrom existing arrangements in that the valve is directly moved toward or to closed positionby a ,low pressure regulator and is thereafter closed or maintained closed, by high pressure fluid independently of the low pressure regulator until such time as the latter moves to a position where it is desired the interrupted supply shall be continued again.

Another object of the invention is to provide an arrangement whereby, in a system of the kind referred to, a low pressure regu. lator serves, when moved to its e'xtremeposition with increase of pressure above the normal, to close the outlet of an operating chamber, associated with the pressure redlicing valve, and permit the aecumulationin such chamber of fluid at the full high pressure of the system which will act to hold the valve closed, the disposition of the parts being such thatA no matter-to what extent the pressure on the high pressure side of the system 'might be increased, no leakage could occur to the low pressure side, avent valve being employed whichrequires to be opened against the high pressurel Huid.

v lVith these and other objects, the invention consists in the arrangements and combinations of parts hereinafter claimed and now about to be described with reference to the accompanying drawings Figure 1 of which is a sectional elevation of a construcing in a mid or working position, Fig. 2

Speccation of Letters Patent.

Patented Mar. 7, 1916.

Application filed May 27, 1912. Serial No. 699,855.

isan elevation of a modification. Fig. 3 is a view similar to Fig. 1 of another constructional form of the apparatus.

As shown in Fig. 1, a casing a is employed having a diaphragm compartment b and low pressure outlet c at one end separated from a high pressure inlet cl atthe other end by the seatings e, f of an ordinary balanced pressure reducing valve g. The stem L of this valve g may protrude in both directions above and below the`casing part aand be connected thereto in a fluid tight manner, as by means of flexible diaphragims z' and clamping rings y', the upper eXtremlty having a loose connection with a weighted lever This lever is shown as pivoted at m to a pillar n with weightso and p at opposite sides thereof, the loose connectionbetween the lever and-the valve stem z, being shown as constituted by a slot 1" in the latter co-aeting witha pin s on the lever. The lever 1 is pivotally secured at one end to a stem t connected to the diaphragm u ofthe low pressure regulator, the said diaphragm being clamped to the top of the compartment b by a protecting cover '1.'. Co-aXially with this diaphragm u, and beneath the bottom of the compartment I) is a branch ce adapted to be connected to the branch of a high pressure chamber y/ coaxial with the pressure reducing valve g. The lower end of the stem h of the valve g extends into the chamber y and isv connected in a fluid tight manner thereto, as by a flexible diaphragm 2, a passage 1 Iand lateral port 2 in the stem L serving to 'permit fluid from the high pressure inlet rZ to enter the chamber y. Communication between the diaphragm compartment Y) or low pressure side of the' 'fluid in the high pressure chamber y.

'the diaphragme Athat closes the chamber y may be clamped in position by a cover 5, and in order that a tight joint may be made where the valve stem passes through it, when the chamber y contains an -accumulated plenum, a ring 6 of resilient material, such' as rubber, may beinterposed, movable say with the diaphragm vin such wise that just prior to closure of the valve g, this ring 6 forms a joint surrounding thel stem' h. Such jointing means need not necessarily be emn ployed With a diaphragm as'shovvn except as a precautionary measure for service in caseV of, say a rupture vo f the latten or of leakage of' gas therethrough, but it.

The inlet d to the `apparatusmay be pro-l vided With a'drip box for the accumulatioii of liquid of condensation, such drip box being shown as comprising vconcentrically arranged parts 7, 8, forming al return passage 9 atan angle to the inlet al,

the outermost part 8, which may have an inspection cover 10,. being fitted With. a

.blovsr off cock 1l. I

'The outlet 'c of the apparatus may be provided with a safety -valve so that 1n the .event of fluid at high pressure obtaining, for any reason, access to the outlet, f a continuance of such supply is prevented. This may comprise a valve 12 so loadedas to normally tend to occupy an open posig5 tion, being shown as acted upon by' gravity A and secured `to a stem 13 free to slide in guides 14 co-aXial with a seat 15 in a cage 16 Ihaving a .flange 17 to enable it to vb e clamped between the lflan es of tWo pipes .18, 1.9 of the apparatus. hould the'regulater fail, any sudden increasein the flow of gas will act to move the valve to its seat i" Where it will be held until thevsystem is put in' proper condition again.

The operation of he. system is las fellowszfAssuming that the low pressure is vthat forvvhich the regulator is set, then i the diaphragm u Will occupy some such y positionfas that shown Where the valve g 40 is vmore or less open and the vent valve 3 also, so that the high pressure Huid that leaks finto .the chamber y Vby Way of the passage 1 and port@ in the stem 7b of the valve fg Will be dissipated in the low preslsure partof the system. If however the `\pre'ssure .inthe low pressure part of the lsystem increases, then the diaphragm uv of the. regulator will rise and in so doing y rock the lever lo and move the valve g nearer tov its closed position, this continui ing, if the pressure continues to rise, Auntil thexvent valve 3 is closed. Whenthis hap- `pens, thefluid in the high pressure cham-v ber g/ accumulatesand gradually completes the closure vof th valve (l, the loose con-` nection 1', s between the stem L and lever kj permitting ofI this independent movement.`

Then the pressure ofx'the low pressure part of thesystem fallssuliciently to render -it necessary to again supply /lluid thereto, the

diaphragm u Will descend, theloose connection r, s being such as toallovv this, and

open the vent valve 3-Whereupon the presy sure in .the chamber i/ Will be reduced and the valve g permitted to open.

In the arrangement described, the b alancing of the regulator diaphragm u, with its associated parts, and thel pressure re-` ducing valve g and;l its 'attachments is 'effectedconjointly by the'ive'ight system 0, p. When however the governor is 1n 'such a -conditionithat the vent .valve is Iclosed thereby preventing the diaphragm u rising further, and the reducing valve g is being normal balance of the governor isA sensibly,

disturbed, thus necessitating a greater drop in pressure at the low pressure side of the governor before the diaphragm u Will descend, than would-otherwise be the case. In vorder to prevent such an occurrence, the diaphragm and thevalve g may be bal-- anced independently ofeach other so that theV conditions "remain practically constant irrespective of the position, that thevalve occupies. This may be effectedA in the case of the example just described by the modification of parts shown in.` Fig. 2 Where a supplementary lever 20 is. pivoted say to the pillar a and connected to the stem IL lof the valve g and valso the lever 7c, the said supplementary lever 2O being inde- 20"-. From this it will be seen that the move the independently balanced reducing pendently loaded as by a counterweight valvel q toward its closed position isprac- .Q

with that of the first construction, Will be necessaryto produce the automatic return -tically negligible and that a smaller drop v '1n' pressure in the chamber b, compared movement of the diaphragm u 'in order to open the vent valve 3; f

.In some cases the high pressure chamberl and the vent valve thereforin lieu of being co-,a-Xialrespectlvely with the pressure re.-

110 ducing valve and diaphragm of the regular. l

tor, may be arranged out of aiinement there- With. Such an arrangementis shown in Fig. 3.. Here a high pressure chamber'21 is y located above the inlet Z and is placed in communication with s uch inlet through a removable control. ,nipple 22. A by-pass pipe 23 connects this chamber to another nipple 2 4 having a seat 25 .at its upper end for a vent Vvalve 26 and extending into .the

diaphragm compartment Z2. v The ventvalve -.x

26 is operated from the diaphragm` u through a double-armed'lever 27y movable i about a stationary fulcrum 28. `The pressure reducing valve Q9, Whichmay haveits seatings 30 formed in a removable lantern 31 is, as before, connected, through a loose joint r, s with the lever 7c; The supplementary le-` ver 20 in addition to being `connected-to the stem 7L of the valve 29`is similarly connected tion to said pressure reducing valve, a vent valve operated by said low pressure regulator and arranged to open and close the communication between the said low pressure outlet and stationary outlet passage, means associated with said chamber for holding the reducing valve in its closed position when said vent valve is closed, means for balancing said reducing valve' and independent balancing means forsaid low pressure regulator.

Q. Fluid pressure regulating apparatus comprising a pressure reducing valve separating a high pressure inlet from a low pressure outlet, a chamber, associated with means for holding the pressure reducing valve closed, in permanent communication with the high pressureinlet and having an independent outlet, a vent valve controlling such outlet and a low pressure regulator operatively connected to both the pressure reducing valve and the vent valve, .the arrangement being such that when the vent valve is closed, the high pressure fluid accumulates in the operating chamber and holds the pressure reducing valve closed.

3. Fluid pressure regulating apparatus comprising a pressure reducing valve separating a high pressure inlet from a lowpi'essure outlet, an operating chamber, associated with means for closing the pressure reducing valve, in permanent communication with the high pressure inlet and having an independent outlet. .a vent valve controlling such outlet land a loiv pressure regulator operatively connected to both the pressure reducing valve and the vent valve, the arrangement being such that when the vent valve is closed, the high pressure fluid accumulates in the operating chamber and effects closure of the pressure reducing valve.

4. Fluid pressure regulating apparatus comprising a pressure reducing valve separating a. high pressure inlet from a low pressure outlet. a chamber, associated with means for holding the pressure reducing valve closed` in permanent communication with the high pressure inlet and having an independent outlet, a vent valve controlling such outlet and a low pressure regulator operatively connected to both the pressure rediicinv valve and the vent valve, the arrangenent being such that When the vent valve is closed, the high pressure fluid accumulates in the operating chamber and holds the pressure reducing and vent valves closed.

5. In vfluid pressure regulating apparatus,

y a pressure reducing valve, a low pressure regulator operatively connected to the pressure reducing valve through articulated members having lost motion between them, means subject to the fluid'at the high pressure side of the reducing valve adapted to close the latter and means controlled by the low 4pressure regulator adapted to render the aforesaid valve closing means operative.

6. In fluid pressure regulating apparatus, a pressure reducing valve, an operating chamber adapted to receive fluid under pressure,'nieans subject to the fluid in such chamber .operatively connected to the reducing valve and means adapted to form a fluid tight joint between the chamber and the valve operating means just prior to closing of the reducing valve.

7. In fluid pressure regulating apparatus, a pressure reducing valve, a ylow pressure regulator, means operatively connecting the moveable elements of the said regulator and valve and means for balancing the said movable elements independently.

8. In Huid pressure regulating apparatus, a pressure reducing valve, ahigh pressure chamber, a low pressure regulator, a vent valve for the high pressure chamber, means for producing simultaneously movement vof the pressure reducing and vent valves with movement of the regulator, and means associated with the high pressure .chamber adapted to produce an independent movement of the pressure reducing valve alone.

y 9. In fluid pressure regulating apparatus,

a pressure reducing valve, a high pressure chamber, a low pressure regulator, a vent valve .for the high pressure chamber, means operatively connectingfthe regulator, vent valve and high pressure valve, means for balancing the weight .of the said operatively connected members', means associated with the high pressure chamber adapted to produce'aii independent movement of the pressure reducing valve alone and means for balancing the Weight of the pressure reducing valve independently of `the other balancing means.

lO. Fluid pressure regulating apparatus A,comprising a reducing valve separating a high pressure inlet from a low pressure outlet, a chamber in permanent communication with the high pressure inlet and having an independent stationary outlet'communicatingwith said low lpressure outlet, a diaphragm associated withsaid chamber so as to be subject to the action of the high pressure fluid therein and connected to and adapted to hold the reducing valve closed when the outlet from lsaidchamber Ais closed,

lalso through a loose chamber, a low pressure regulator adapted to open and close said vent valve and a loaded ylever lexternal, to the valve casing, chamber and 10W pressure regulator, and connected to said low pressure regulator and connection to said reducing valve.

o 1l. Fluid pressure comprising a reducing valve separating a high pressure inlet fro-1n a low pressure outlet, a chamber in permanent comlnunication With thehigh. pressure inlet, a` stationary outlet passage between the said chamber and the said low pressure outlet, a 10W pressure regulator, a vent valve operated by said low pressure regulator and arranged to open reducing apparatusmvfrese and close said Aoutletl passage, a diaphragm associated With said chamber and adapted to be operated by the high pressure Huid pressure therein, when 'the vent valve is closed, t0

close the reducing valve v and hold it closed,

a loaded external lever connected to said lov:7

EDWARD ALBERT MITCHELL. -Witnesses y l R. N. Wzes'roonk'r,- 1 l HJD, JAMn'soN. 

